Author Topic: Brake piston / pad nylon spacer (Read 6962 times)

Chris Liston · « **on:** October 04, 2005, 06:31:07 AM »

How important is the nylon washer that fits between the piston and the pad. When rebuilding my brakes yesterday I overlooked it and installed everything up. The bike brakes fine. I'm going to take it all apart again and install it anyway. Mr. Honda figured it should be there so I won't mess with that.

Just wondering whats its there for.

Thanks

bryanj · « **Reply #1 on:** October 04, 2005, 06:35:43 AM »

No idea!, best idea i can come up with is to give a bit of cushion and maybee "tillt" to the pad

SteveD CB500F · « **Reply #2 on:** October 04, 2005, 06:44:00 AM »

I thought it was to stop bralke squeal. Never tried one without it though.

Paul · « **Reply #3 on:** October 04, 2005, 09:25:59 AM »

I'm not entirely sure if it's for brake squeal (I mentioned this before) but my most recent trick was to put IN a nylon spacer (Home made but sufficient). And my brake squeal has now gone from a shreik to nothing.
Then I'm thinking...isn't there a dimple on the back of the brake pad, and iiffff there wasn't a hollow in protruding part of the piston like there is on most, wouldn't the ring spacer keep the dimple from "Rocking" on contact.

TwoTired · « **Reply #4 on:** October 04, 2005, 09:45:38 AM »

The Nylon ring may have had mutiple purposes. Among the others listed here, I once heard the nylon was put in there to soften the brake lever, so it felt more like the front drum brake of old. The front disk brake was a production inovation at the time.

Personally, I think the most important contribution is to guide the brake puck wear so as to keep it from cocking and jamming in the caliper bore over the life of the brake pad.

bike54 · « **Reply #5 on:** October 04, 2005, 09:49:02 AM »

Quote from: SteveD CB500F on October 04, 2005, 06:44:00 AM

I thought it was to stop bralke squeal. Never tried one without it though.

noise is just vibration in the air the nylon acts as a asober and cuts it down by my understanding

merv

Chris Liston · « **Reply #6 on:** October 04, 2005, 10:19:12 AM »

After reading some replies it makes sense to have it there but as Paul wrote there is a dimple in the piston and a bad as a protruding area that fits perfect into the piston. The lever is solid and feels very responsive. The nylon is probably there to act as a buffer between piston and pad and soften the feel alittle. I doubt it would hurt not having it there but I'll replace it anyway. I'll post the before and afters feels.

eldar · « **Reply #7 on:** October 04, 2005, 10:44:09 AM »

I would say it is for both noise and alignment. I think it may also help protect the piston from damage as the nylon would absorb harder shocks THAT MAY occur. None of us function as brakes so we do not know what types of shocks they might take. I would rather keep my piston in good shape than have to replace it. Damn things are expensive!

Chris Liston · « **Reply #8 on:** October 04, 2005, 01:46:12 PM »

Eldar, I here that. This piston is brand new and want it to last.

eldar · « **Reply #9 on:** October 04, 2005, 01:57:33 PM »

$50 for a some piston on ebay, hate to see what the dealer gouges a person for!

Chris Liston · « **Reply #10 on:** October 04, 2005, 02:43:37 PM »

Try $80 US. I got mine for around 25pound UK from David Silver. still made out under dealer costs with piston seal and shipping. saved about 30 bucks.

78 k550 · « **Reply #11 on:** October 04, 2005, 05:41:34 PM »

I havent had one apart. If there is metal to metal without the nylon it could were out the piston some how or do other damage.

Paul

Bob Wessner · « **Reply #12 on:** October 04, 2005, 07:01:36 PM »

Been following this post. Is this part unique to the 550? Where exactly is it??

mick750F · « **Reply #13 on:** October 04, 2005, 07:14:53 PM »

Quote from: Bob Wessner on October 04, 2005, 07:01:36 PM

Been following this post. Is this part unique to the 550? Where exactly is it??

Bob, this has nothing to do with carburetors. Are you sure you're in the right post?

Mike

Chris Liston · « **Reply #14 on:** October 04, 2005, 07:15:44 PM »

Its a nylon/plastic washer about 1/8" thick that sits between the caliper piston and pad.

piston / spacer / pad

Bob Wessner · « **Reply #15 on:** October 04, 2005, 07:19:14 PM »

Nah, just curious. On the 750, at least earlier ones, there's just a floating metal cap between the pad and the piston.

mick750F · « **Reply #16 on:** October 04, 2005, 07:35:33 PM »

Quote from: Bob Wessner on October 04, 2005, 07:19:14 PM

Nah, just curious. On the 750, at least earlier ones, there's just a floating metal cap between the pad and the piston.

Nothing like it on the '78 750F either...

Mike

eldar · « **Reply #17 on:** October 04, 2005, 10:00:48 PM »

I have a nylon ring on my 750 78K

bryanj · « **Reply #18 on:** October 05, 2005, 01:05:46 AM »

From memory ALL the disc brakes had that nylon washer but as soon as the caliper was split it got lost Rather like the steel waser between the spring and oil filter!

Bob Wessner · « **Reply #19 on:** October 05, 2005, 02:10:44 AM »

Don't think so. I thought perhaps the same thing re: my 750, so I checked the parts list and diagrams. No nylon washer, just the floating metal cap I described. Not sure why the design diff, but there is one between the models on this score.

dusterdude · « **Reply #20 on:** October 05, 2005, 06:26:15 AM »

mine also has the metal cap.

eldar · « **Reply #21 on:** October 05, 2005, 07:53:20 AM »

Probably was redone in later models.

Jonesy · « **Reply #22 on:** October 05, 2005, 03:08:55 PM »

The CB360 also uses the nylon washer. A new one was included in the brake pad kit.

Chris Liston · « **Reply #23 on:** October 05, 2005, 04:21:27 PM »

Well, I reinstalled the nylon washer tonight after work and it is there to soften the lever feel. Probably really there so the piston and pad don't make direct contact but the lever is definetely much softer feeling. Feels like I need to bleed the system again. I much preferred it not being there as far as feel goes. Bike still stops great with the new pads and rotor though.

Chris

bryanj · « **Reply #24 on:** October 07, 2005, 02:30:00 AM »

OK the 500/550 parts book dont even show the thing and whilst you can see it in the 350/400 there is no part number same as 750F. Its shown as a seperate part in CB750K0-4 and whilst the picture shows it shaped i am certain the UK K2 (which was all we had till the K7) had a nylon washer same as 500. As I remember it the only way to get one was with a genuine honda pad kit, all the aftermarket ones you had to transfer the original

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Author Topic: Brake piston / pad nylon spacer (Read 6962 times)

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